2、超亲优势(Over-parent heterosis):这是以双亲中较优秀的一个亲本的均匀值作为衡量规范,衡量F1均匀值逾越高值亲本的百分率。公式如下:
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...平均优势(heterosis over mean of parents): F 1 超过 其双亲平均数的百分率; 超亲优势(heterosis over better of parents) :F 1 超过 其双亲中最优亲本的百分率; 超标优势(heterosis over CK) :F 1 超过当地推广的 最优良品种的百分率。 2.
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超优亲优势 Superiority over better-parent
From the proportion of over-parent heterosis, the heterosis of hybrid combinations was stronger in plant height,100-grain weight, Single Plant Yield,leaf area of the ear,ear height,ASI and ear row number, and over-high parent heterosis was 64%、60%、56%、52%、48%、48%、44%.
杂交种与其双亲相比,从超亲优势分布上看,在株高、百粒重、单株产量、叶面积、穗位高、ASI、穗行数等性状表现出超高亲优势,超亲优势分布比例分别为64%、60%、56%、52%、48%、48%、44%。
参考来源 - 早熟玉米耐旱性鉴定及其抗旱性状的遗传参数分析·2,447,543篇论文数据,部分数据来源于NoteExpress
不同组合间的SCA效应与超亲优势呈正相关关系。
The SCA effects of different crosses were positively correlated with super parent heterosis.
衣分的群体平均优势在两代均为正向,群体超亲优势均为负向且达到1%显著水平;
The mid-parent value for lint percentage in the two generations are positive, the better-parent value are negative to 1% significance level;
因此在耐热育种中单纯利用杂交优势试图获得超亲优势来显著提高耐热性是不现实的,而应该注重耐热亲本的定向选择。
So it is not practical to improve the heat resistance significantly in breeding by heterosis, but it is supposed to select the heat tolerant parent in breeding.
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